Datasheet LT1394 (Analog Devices) - 10

LT1394
U U W U APPLICATIONS INFORMATION
5.8M* 5V – 1M* LM134 2M A1 LT1077 226Ω* + 1M* 1µF MV-209 10mV/°C VARACTOR 2M DIODE 10k* 470k* 10M 0.01µF 10MHz 2k 10MHz 5V + 0.05ppm/°C LT1394 0.01µF 390Ω BAT-85 50k – 100k 2k 1 4.7k µF + LT1004-1.2 0.068µF 1M FREQ SET 1394 F05 XTAL AT-CUT, 35° 25′ ANGLE * 1% FILM RESISTOR
Figure 5. Temperature-Compensated 10MHz Crystal Oscillator. Temperature-Dependent Varactor Bias Reduces Drift by 20:1
5V + 0 A2 200pF –10 COMPENSATED 1/2 LT1126 ≈ 0.05ppm/°C 2k – 10k –20 –30 200Ω –40 –50 UNCOMPENSATED – 10k (VARACTOR CORRECTION A3 FREQUENCY DEVIATION (ppm) –60 DISABLED) –1ppm/°C 1/2 LT1126 –70 + 0 10 20 30 40 50 60 70 2k –5V TEMPERATURE (°C) 200pF 1394 F06 5V 1k 1µF + +
Figure 6. Figure 5’s Compensated vs Uncompensated
+ +INPUT A1
Temperature Dependence. First Order Compensation
LM733 OUTPUT LT1394
Reduces Oscillator Drift to 0.05ppm/
°
C
–A = 100 – –INPUT – 1µF 1k –5V 1394 F07
Figure 7. Parallel Preamplified Paths Allow 18ns Comparator Response to 500
µ
V Overdrive
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